Identifying Dansgaard/Oeschger Cycles during the Penultimate Glacial

识别倒数第二次冰川期间的丹斯加德/厄施格旋回

• 批准号: 322834905
• 负责人: Dr. Jens Fohlmeister
• 金额: --
• 依托单位: Sektion 4.3: Klimadynamik und Landschaftsentwicklung
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2016
• 资助国家: 德国
• 起止时间: 2015-12-31 至 2021-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/322834905?language=en
• 关键词: Identifying; Dansgaard; Oeschger; Cycles; during

In this project, Dansgaard/Oeschger events in the penultimate glacial, between 170 000 to 130 000 years before present, will be identified and the beginning and the duration of each event will be precisely determined. Dansgaard/Oeschger events are short-lasting and repeating warm episodes during the last glacial and seem to follow a certain cyclicity. Originally, they were first observed by fast variations in the stable oxygen isotope composition of ice cores drilled on Greenland. They seem to left hints of their occurrence in various climate archives over large parts of the northern hemisphere. Their finger prints, for example, were also observed in the stable oxygen isotope composition of speleothems from the northern rim of the European Alps over the last 100 000 years. However, information about the Dansgaard/Oeschger events during the penultimate glacial is limited. Greenlands ice cores do not cover this time interval since no ice of such age is available. Marine sediments clearly show Dansgaard/Oeschger like pattern in their proxies in this period - however a precise chronology is difficult to obtain from this archive. For this project we have four stalagmites from the northern Alps which grew during the penultimate glacial. Over large time intervals pairs of them grew contemporaneously, so that a high degree of reproducibility is granted. Stable oxygen isotope analyses will provide strong evidence for the existence of these fast climate variations and the uranium-thorium method will be used to establish a precise chronology. Thus, this approach is able to contribute significantly to improve our knowledge of the chronology of these climate variations during the penultimate glacial and will help to understand their impacts on climate in the northern hemisphere and their cyclicity.

在该项目中，将确定距今 17 万至 13 万年前的倒数第二次冰川中发生的 Dansgaard/Oeschger 事件，并精确确定每个事件的开始和持续时间。丹斯加德/厄施格事件持续时间短，并且在末次冰期期间重复出现温暖事件，并且似乎遵循一定的周期性。最初，它们是通过格陵兰岛冰芯稳定氧同位素组成的快速变化首次观察到的。它们似乎在北半球大部分地区的各种气候档案中留下了它们发生的线索。例如，在过去 10 万年欧洲阿尔卑斯山北缘洞穴化石的稳定氧同位素组成中也观察到了它们的指纹。然而，有关倒数第二次冰川期间丹斯加德/厄施格事件的信息有限。格陵兰冰芯不涵盖这个时间间隔，因为没有这样年龄的冰。海洋沉积物在这一时期的代理中清楚地显示出类似于 Dansgaard/Oeschger 的模式 - 然而很难从该档案中获得精确的年代学。在这个项目中，我们有四颗来自北阿尔卑斯山的石笋，它们是在倒数第二次冰川期间生长的。在较长的时间间隔内，它们成对同时生长，因此具有高度的可重复性。稳定氧同位素分析将为这些快速气候变化的存在提供强有力的证据，而铀钍法将用于建立精确的年代学。因此，这种方法能够极大地提高我们对倒数第二次冰川期间这些气候变化的年代学的了解，并将有助于了解它们对北半球气候的影响及其周期性。

项目成果

Evidence of warm and humid interstadials in central Europe during early MIS 3 revealed by a multi-proxy speleothem record

• DOI: 10.1016/j.quascirev.2018.09.045
• 发表时间: 2018-11
• 期刊: Quaternary Science Reviews
• 影响因子: 4
• 作者: Michael Weber;D. Scholz;A. Schröder‐Ritzrau;M. Deininger;C. Spötl;F. Lugli;R. Mertz‐Kraus;K. Jochum;J. Fohlmeister;Cintia F. Stumpf;D. Riechelmann

Modelling the 14C bomb-pulse in young speleothems using a soil carbon continuum model

• DOI: 10.1016/j.gca.2019.04.029
• 发表时间: 2019-09
• 期刊: Geochimica et Cosmochimica Acta
• 影响因子: 5
• 作者: M. Markowska;J. Fohlmeister;P. Treble;A. Baker;M. Andersen;Q. Hua

Radiocarbon Dating of a Speleothem Record of Paleoclimate for Angkor, Cambodia

• DOI: 10.1017/rdc.2017.115
• 发表时间: 2017-12
• 期刊: Radiocarbon
• 影响因子: 8.3
• 作者: Q. Hua;Duncan E. Cook;J. Fohlmeister;D. Penny;P. Bishop;S. Buckman

Evaluating the potential of tree-ring methodology for cross-dating of three annually laminated stalagmites from Zoolithencave (SE Germany)

• DOI: 10.1016/j.quageo.2019.04.001
• 发表时间: 2019-06
• 期刊: Quaternary Geochronology
• 影响因子: 2.7
• 作者: D. Riechelmann;J. Fohlmeister;T. Kluge;K. Jochum;D. Richter;M. Deininger;R. Friedrich;N. Frank;D. Scholz

STAlagmite dating by radiocarbon (star): A software tool for reliable and fast age depth modelling

• DOI: 10.1016/j.quageo.2019.02.008
• 发表时间: 2019-04-01
• 期刊: QUATERNARY GEOCHRONOLOGY
• 影响因子: 2.7
• 作者: Fohlmeister, Jens;Lechleitner, Franziska A.
• 通讯作者: Lechleitner, Franziska A.